<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>按钮阴影</title>
    <style>
        /* 我们可以使用 box-shadow 属性来为按钮添加阴影: */
        .button {
            /* Green */
            background-color: #4CAF50;
            border: none;
            color: white;
            padding: 15px 32px;
            text-align: center;
            text-decoration: none;
            display: inline-block;
            font-size: 16px;
            margin: 4px 2px;
            cursor: pointer;
            /* Safari */
            -webkit-transition-duration: 0.4s;
            transition-duration: 0.4s;
        }

        .button1 {
            box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
        }

        .button2:hover {
            box-shadow: 0 12px 16px 0 rgba(0, 0, 0, 0.24), 0 17px 50px 0 rgba(0, 0, 0, 0.19);
        }
    </style>
</head>

<body>

    <h2>按钮阴影</h2>
    <p>我们可以使用 box-shadow 属性来为按钮添加阴影:</p>

    <button class="button button1">阴影按钮</button>
    <button class="button button2">鼠标悬停后出现阴影</button>

</body>

</html>